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Acts As Commentable (now with comment threads (TM)!!! -- kidding on the (TM))

Allows for threaded comments to be added to multiple and different models. Drop-in compatible for acts_as_commentable (however requiring a database schema change)


This gem is for Rails 3 and later versions only.

This gem depends on CollectiveIdea's Awesome Nested Set gem. It is installed if not already present when you install this gem.

You can find the gem on GitHub at


In your Gemfile, add gem 'acts_as_commentable_with_threading'

and run bundle install.


  • To install from scratch:

    rails generate acts_as_commentable_with_threading_migration

    This will generate the migration script necessary for the table

  • To upgrade to acts_as_commentable_with_threading from the old acts_as_commentable:

    rails generate acts_as_commentable_upgrade_migration

    This will generate the necessary migration to upgrade your comments table to work with acts_as_commentable_with_threading

If the generators fail, you can just as easily create the migrations by hand. See the templates in the generators under lib/generators.


class Article < ActiveRecord::Base
  • Add a comment to a model instance, for example an Article

    @article = Article.find(params[:id])
    @user_who_commented = @current_user
    @comment = Comment.build_from(@article,, "Hey guys this is my comment!" )
  • To make a newly created comment into a child/reply of another comment

  • To retrieve all comments for an article, including child comments

    @all_comments = @article.comment_threads
  • To retrieve only the root comments without their children comments

    @root_comments = @article.root_comments
  • To check if a comment has children

  • To verify the number of children a comment has

  • To retrieve a comments children


*If you plan to use the acts_as_voteable plugin with your comment system be sure to uncomment two things:

in lib/comment.rb uncomment the line acts_as_voteable

in lib/acts_as_commentable_with_threading.rb uncomment the line include Juixe::Acts::Voteable near the top


xxx - For contributing the updates for Rails 3!

Jack Dempsey - This plugin/gem is heavily influenced/liberally borrowed/stole from acts_as_commentable

which in turn credits....

Xelipe - Because acts_as_commentable was heavily influenced by Acts As Taggable.